Pre-connectorized fiber optic distribution cable having overmolded access location

• US 20060093278A1
• Filed: 11/03/2004
• Published: 05/04/2006
• Est. Priority Date: 11/03/2004
• Status: Active Grant

• Current Assignee: Corning Cable Systems LLC (Corning Incorporated), Grunenthal GMBH (Grünenthal Pharma GmbH & Co. KG)
• Original Assignee: Grunenthal GMBH (Grünenthal Pharma GmbH & Co. KG)
• Inventors: Luther, James P., Theuerkorn, Thomas, Elkins, Robert B. II, Nielsen, Lars K.
• Granted Patent: US 7,266,274 B2
• Time in Patent Office: Days
• US Class Current: 385/76
• CPC Class Codes: G02B 6/4431 with provision in the protective covering, e.g. weak line, for gaining access to one or more fibres, e.g. for branching or tapping break-out terminations G02B6/4471
• CPC Class Codes: G02B 6/4473 Three-way systems

Abstract

A pre-connectorized fiber optic distribution cable assembly includes a plurality of optical fibers and at least one mid-span access location along the length of the distribution cable. At least one of the optical fibers is accessed, terminated and then connectorized at the mid-span access location to an optical connector disposed within a receptacle. The mid-span access location, the accessed, terminated and connectorized optical fiber, the optical connector and at least a portion of the receptacle are encapsulated with a protective overmolded shell. A tether including at least one optical fiber connectorized at a first end of the tether is optically connected to the optical connector through the receptacle. A second end of the tether opposite the first end terminates in a network optical connection terminal, thereby compensating for a span length measurement difference between the actual location of the mid-span access and the desired location of the optical connection terminal.

Claims

1. A pre-connectorized fiber optic distribution cable assembly, comprising:

a distribution cable comprising a plurality of optical fibers disposed within the distribution cable and at least one factory-assembled mid-span access location along the length of the distribution cable;

at least one of the plurality of optical fibers of the distribution cable accessed and terminated from the distribution cable at the mid-span access location;

at least one optical connector mounted upon the end of the at least one accessed and terminated optical fiber;

a receptacle for receiving the at least one optical connector therein; and

an injection molded shell encapsulating the mid-span access location, the at least one accessed and terminated optical fiber, the at least one connector and at least a portion of the receptacle, the receptacle providing access to the at least one optical connector without having to enter the shell.

2. The fiber optic distribution cable assembly of claim 1, further comprising a tether having a connectorized first end that is interconnected in the field with the at least one optical connector, wherein the tether is operable for mitigating span length differences in a pre-engineered fiber optic communications network.

3. The fiber optic distribution cable assembly of claim 2, wherein the tether comprises a second end opposite the first end terminating in a network optical connection terminal for optically connecting the distribution cable with a fiber drop cable or fiber optic branch cable.

4. The fiber optic distribution cable assembly of claim 3, wherein the second end of the tether is connectorized and disposed within the network optical connection terminal.

5. The fiber optic distribution cable assembly of claim 3, wherein the second end of the tether is connectorized and disposed within a multi-port connection terminal comprising at least one connector port.

6. The fiber optic distribution cable assembly of claim 2, wherein the tether has a length greater than about 3 feet.

7. The fiber optic distribution cable assembly of claim 1, wherein the at least one accessed and terminated optical fiber of the distribution cable is direct connectorized to the at least one optical connector and disposed within the injection molded shell.

8. The fiber optic distribution cable assembly of claim 1, wherein the at least one accessed and terminated optical fiber of the distribution cable is optically spliced to a length of optical fiber having the at least one optical connector mounted thereon and disposed within the injection molded shell.

9. The fiber optic distribution cable assembly of claim 1, wherein the at least one mid-span access location has a length of between about 12 and about 36 inches.

10. The fiber optic distribution cable assembly of claim 1, further comprising a removable cover for protecting and providing access to the receptacle.

11. The fiber optic distribution cable assembly of claim 1, wherein the receptacle comprises an alignment sleeve operable for receiving and aligning the at least one optical connector and a connectorized first end of a fiber optic drop cable or tether.

12. A fiber optic distribution cable assembly, comprising:

a distribution cable comprising a tube containing a plurality of optical fibers and at least one factory-assembled mid-span access location along the length of the distribution cable;

a plurality of optical fibers accessed and terminated from the distribution cable at the mid-span access location;

a first multi-fiber connector mounted upon the ends of the optical fibers accessed and terminated from the distribution cable;

a receptacle for receiving and aligning the first multi-fiber connector with a multi-fiber connector of a fiber optic cable in the field following installation of the distribution cable; and

a tether comprising a plurality of optical fibers disposed within the tether, a second multi-fiber connector mounted upon the ends of the optical fibers at a first end of the tether and a second end opposite the first end terminating in a network optical connection terminal.

13. A fiber optic distribution cable assembly according to claim 12, further comprising a protective overmolded shell encapsulating the mid-span access location, the plurality of optical fibers accessed and terminated from the distribution cable, the first multi-fiber connector and at least a portion of the receptacle such that the tether can be attached to the first multi-fiber connector without entering the shell.

14. The fiber optic distribution cable assembly of claim 13, wherein the second multi-fiber connector is optically connected to the first multi-fiber connector through the receptacle.

15. The fiber optic distribution cable assembly of claim 12, wherein the tether is connectorized at the second end.

16. The fiber optic distribution cable assembly of claim 15, wherein the network optical connection terminal at the second end of the tether comprises at least one connector port for optically connecting the distribution cable to a fiber optic drop cable or fiber optic branch cable.

17. The fiber optic distribution cable assembly of claim 12, wherein the tether is splice-ready at the second end.

18. The fiber optic distribution cable assembly of claim 12, wherein the tether has a length greater than about 3 feet.

19. The fiber optic distribution cable assembly of claim 12, wherein the plurality of optical fibers accessed and terminated from the distribution cable are direct connectorized to the first multi-fiber connector.

20. The fiber optic distribution cable assembly of claim 12, wherein the plurality of optical fibers accessed and terminated from the distribution cable are optically spliced to a length of optical fibers having the first multi-fiber connector mounted upon their ends.

21. A method for mitigating a span length measurement difference in a pre-engineered fiber optic communications network employing a fiber optic distribution cable assembly comprising a distribution cable having a plurality of optical fibers disposed within a sheath and at least one mid-span access location along the length of the distribution cable, the method comprising:

removing a section of the sheath of the distribution cable at the mid-span access location;

accessing at least one of the plurality of optical fibers of the distribution cable within the section of the sheath removed from the distribution cable;

terminating the at least one optical fiber of the distribution cable accessed within the section of the sheath removed from the distribution cable;

connectorizing the at least one accessed and terminated optical fiber of the distribution cable;

injection molding around the mid-span access location and the at least one accessed, terminated and connectorized optical fiber of the distribution cable to produce an overmolded shell that provides access to the at least one accessed, terminated and connectorized optical fiber without entering the shell.

22. The method of claim 21, further comprising installing the distribution cable assembly in the pre-engineered fiber optic communications network;

optically connecting a tether having a connectorized first end to the at least one accessed, terminated and connectorized optical fiber of the distribution cable at the mid-span access location; and

positioning a second end of the tether opposite the first end at a desired location in the fiber optic communications network to compensate for the span length measurement difference.

23. The method of claim 22, wherein the first end of the tether is optically connected to the at least one accessed, terminated and connectorized optical fiber of the distribution cable at the mid-span access location through a receptacle operable for mating opposing optical connectors or ferrules.